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Questions and Answers
What happens when you assign a value from a larger integer type to a smaller integer type?
What happens when you assign a value from a larger integer type to a smaller integer type?
Which of the following is a valid way to initialize a character variable in C?
Which of the following is a valid way to initialize a character variable in C?
If you have a short int variable and an int variable, what happens when you perform an arithmetic operation on them?
If you have a short int variable and an int variable, what happens when you perform an arithmetic operation on them?
What is the output of the following code? char c = 65; printf("%d", c);
What is the output of the following code? char c = 65; printf("%d", c);
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Which of the following is a valid way to declare multiple variables of the same type in a single statement?
Which of the following is a valid way to declare multiple variables of the same type in a single statement?
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What is the range of values that can be stored in a short int variable?
What is the range of values that can be stored in a short int variable?
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What is the output of the following code? int x = 65; char c = x; printf("%c", c);
What is the output of the following code? int x = 65; char c = x; printf("%c", c);
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Which of the following is a valid way to declare a variable name in C?
Which of the following is a valid way to declare a variable name in C?
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What happens when you assign a value from a floating-point type to an integer type?
What happens when you assign a value from a floating-point type to an integer type?
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Which of the following is a valid way to declare and initialize a character variable in C?
Which of the following is a valid way to declare and initialize a character variable in C?
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Study Notes
Converting Unsigned Char to Int
- The unsigned char
11001101is converted to0000000011001101in int form.
Converting Int to Char/Short
- When a char or short int is assigned an int value, it is converted back to its original size by removing surplus bits on the left.
Converting Signed/Unsigned Values
- When a signed value is converted to an int, the left bits are filled with 1s if the leftmost bit is set, preserving negative values.
- When an unsigned value is converted to an int, the left bits are filled with 0s.
Mixing Variable Types in Expressions
- C allows mixtures of variable types in expressions, following these rules:
- Char or short variables are converted to int.
- If any variables are long, all char, short, and int variables are converted to long.
- If any variables are unsigned, all signed variables are converted to unsigned.
Weakly Typed Language
- C is a weakly typed language, allowing variables and constants of differing types to be mixed in expressions or assignments without explicit conversion functions.
- Automatic conversions take place between character, integer, and floating-point values.
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Description
This quiz covers the conversion of an unsigned char value to an int in C programming, where the process involves expanding the number of bits. It also discusses handling char or short variables by converting to the size of an int and removing surplus bits on the left.
